Lineage fusion in<scp>G</scp>alápagos giant tortoises

Garrick, Ryan C.; Benavides, Edgar; Russello, Michael A.; Hyseni, Chaz; Edwards, Danielle L.; Gibbs, James P.; Tapia, Washington; Ciofi, Claudio; Caccone, Adalgisa

doi:10.1111/mec.12919

Cited by 67 publications

(97 citation statements)

References 79 publications

(154 reference statements)

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“…lineage fusion. A phenomenon characteristic for some taxa in re-colonized insular biogeographic systems, such as in giant tortoises Chelonoidis becki from Galápagos Islands [80,81]. Thus, in our model, the lineage fusion pattern in the host is virtually opposite to the lineage fission, i.e.…”

Section: Discussionmentioning

confidence: 93%

Discordant population histories of host and its parasite: A role for ecological permeability of extreme environment?

2017

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Biogeographical and ecological barriers strongly affect the course of micro-evolutionary processes in free living organisms. Here we assess the impact of a recently emerged barrier on populations of limnic fauna. Genetic diversity and population structure in a host-parasite system (Wenyonia virilis tapeworm, Synodontis schall catfish) are analyzed in the recently divided Turkana and Nile basins. The two basins, were repeatedly connected during the Holocene wet/dry climatic oscillations, following late Pleistocene dessication of the Turkana basin. Mitochondrial DNA sequences for cytochrome oxidase I gene (cox I) and a whole genome scanning method—amplified fragment length polymorphism (AFLP) were employed. A total of 347 cox I sequences (representing 209 haplotypes) and 716 AFLP fragments, as well as 120 cox I sequences (20 haplotypes) and 532 AFLP fragments were obtained from parasites and hosts, respectively. Although results indicate that host and parasite populations share some formative traits (bottlenecks, Nilotic origin), their population histories/patterns differ markedly. Mitochondrial analysis revealed that parasite populations evolve significantly faster and show remarkably higher genetic variability. Analyses of both markers confirmed that the parasites undergo lineage fission, forming new clusters specific for either freshwater or saline parts of Lake Turkana. In congruence with the geological history, these clusters apparently indicate multiple colonisations of Lake Turkana from the Nile. In contrast, the host population pattern indicates fusion of different colonisation waves. Although fish host populations remain connected, saline habitats in Lake Turkana (absent in the Nile), apparently pose a barrier to the gene flow in the parasite, possibly due to its multihost lifecycle, which involves freshwater annelids. Despite partially corroborating mitochondrial results, AFLP data was not sufficiently informative for analyzing populations with recently mixed biogeographic histories.

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Section: Discussionmentioning

confidence: 93%

Discordant population histories of host and its parasite: A role for ecological permeability of extreme environment?

2017

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“…The polyphyly of F. espiritusantoana and F. pascali from Vanuatu is confusing (the latter here represented only once, but see Zielske & Haase, ) and these taxa appear, surprisingly, in the AI clade (see Zielske & Haase, ). The recently described effect of ancient lineage fusion (Garric et al ., ) might be a plausible explanation for this finding.…”

Section: Discussionmentioning

confidence: 99%

The enigmatic pattern of long‐distance dispersal of minute freshwater gastropods (Caenogastropoda, Truncatelloidea, Tateidae) across the South Pacific

Zielske

Ponder

Haase

2016

Journal of Biogeography

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Aim Tateid freshwater gastropods have an enigmatic distribution in the South Pacific (SP) region. We reconstructed their diversification and dispersal pathways and estimated a timeframe for their radiations. Location New Caledonia, Vanuatu, Fiji, the Austral Islands, further species from Sulawesi, Australia, New Zealand and Lord Howe Island. Methods Bayesian and maximum likelihood methods were used to calculate dated phylogenies based on two mitochondrial and three nuclear gene fragments, test hypotheses and perform ancestral range reconstructions. We compared two calibration strategies based on the COI substitution rate and two sets of island ages selected (1) independent of the ancestral range reconstruction and (2) using information from the latter. Results The common ancestor of the SP Tateidae occurred in Australia. Its descendents colonized Sulawesi and Lord Howe Island and gave rise to the radiations on New Caledonia and New Zealand. The more remote archipelagos harbouring the genus Fluviopupa Pilsbry, 1911 were colonized out of New Zealand. Fluviopupa evolved on the Austral Islands and colonized the archipelago against the progression rule from east to west. Vanuatu was colonized twice independently from the Austral Islands and served as hub for dispersal events to Fiji and Lord Howe Island. The second strategy for calibrating the time trees resulted in considerable younger colonization estimates, was generally well in accordance with the geological record and required fewer ad hoc hypotheses to explain the diversification and dispersal pattern. Main conclusions Our analyses of the evolutionary history of Tateidae across the SP revealed several enigmatic aspects not in accordance with the dominant pattern published for other taxa. In particular, the complex westward dispersal pathways of Fluviopupa, which originated on the Austral Islands but had an ancestor in New Zealand, are unique. Geographical distance was not an appropriate predictor of relationships.

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“…Although introgressive hybridization is now increasingly viewed as a driving force in speciation [9,10], the overall pattern observed in marine iguanas resembles more the process of despeciation, described for Darwin's finches [14], where one species is genetically absorbed into another via hybridization [15], or lineage fusion, as seen in Galápagos giant tortoises from Volcano Wolf on Isabela [17]. By contrast, the phylogeny of Galápagos land iguanas reflects ancient and fully completed speciation, at least in the case of C. marthae [55], which diverged around 1.52 Ma (figure 1b).…”

Section: Discussion (A) Evolutionary Age Of Galápagos Iguanas Coincidmentioning

confidence: 99%

“…Further examples are available from the wellstudied Galápagos giant tortoises, where lineage fusion through introgressive hybridization was recently revealed on the largest island of the archipelago, Isabela. Here, two morphologically and genetically distinct evolutionary lineages colonized the island at different times, coexisted as distinct entities for a period, and then merged into one lineage [17]. Thus, it seems that hybridization as an evolutionary process continues to offer new avenues for evolutionary biologists to explore.…”

Section: Introductionmentioning

confidence: 99%

Hybridization masks speciation in the evolutionary history of the Galápagos marine iguana

et al. 2015

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The effects of the direct interaction between hybridization and speciation-two major contrasting evolutionary processes-are poorly understood. We present here the evolutionary history of the Galápagos marine iguana (Amblyrhynchus cristatus) and reveal a case of incipient within-island speciation, which is paralleled by between-island hybridization. In-depth genome-wide analyses suggest that Amblyrhynchus diverged from its sister group, the Galápagos land iguanas, around 4.5 million years ago (Ma), but divergence among extant populations is exceedingly young (less than 50 000 years). Despite Amblyrhynchus appearing as a single long-branch species phylogenetically, we find strong population structure between islands, and one case of incipient speciation of sister lineages within the same island-ostensibly initiated by volcanic events. Hybridization between both lineages is exceedingly rare, yet frequent hybridization with migrants from nearby islands is evident. The contemporary snapshot provided by highly variable markers indicates that speciation events may have occurred throughout the evolutionary history of marine iguanas, though these events are not visible in the deeper phylogenetic trees. We hypothesize that the observed interplay of speciation and hybridization might be a mechanism by which local adaptations, generated by incipient speciation, can be absorbed into a common gene pool, thereby enhancing the evolutionary potential of the species as a whole.

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Lineage fusion inGalápagos giant tortoises

Cited by 67 publications

References 79 publications

Discordant population histories of host and its parasite: A role for ecological permeability of extreme environment?

Discordant population histories of host and its parasite: A role for ecological permeability of extreme environment?

The enigmatic pattern of long‐distance dispersal of minute freshwater gastropods (Caenogastropoda, Truncatelloidea, Tateidae) across the South Pacific

Hybridization masks speciation in the evolutionary history of the Galápagos marine iguana

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